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This is a nice example of a call exchange model No 312L.

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Here is a very nice example of a GPO 312L with drawer as you can see from the pictures below. The Call exchange was used for shared lines and is no longer used on the modern system but is a very nice visual feature. This one is marked 164 54 on the handset. The dial is a genuine GPO No 12 metal backed alpha numeric and not a later cheaper dial fitted to so many of the telephones I see being sold. I have fitted it with a best quality hand plaited all British manufactured braided handset cord, an electronic microphone to bring the speech quality up to modern standards and a GPO specification round plastic line in cord with a UK telephone socket. It has been set up on a special line simulator to allow the dial to be calibrated to the correct speed and make and break on the contacts and then tested on my BT line to make sure all is working perfectly. This is ready to simply plug in and go. I can make a dial label with your information at no extra cost.